The LM5085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5-V to 75-V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultrafast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5085/-Q1 75-V Constant On-Time PFET Buck Switching Controller datasheet (Rev. I) | PDF | HTML | 12 Aug 2015 |
| Technical article | Crafty idea: Create a 150V non synchronous buck solution with a lower Vin rated co | PDF | HTML | 25 Aug 2017 | |
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 21 Jul 2016 | ||
| Technical article | How to design for EMC and isolation with Fly-Buck™ converters | PDF | HTML | 28 Jul 2015 | |
| Application note | Transient Response versus Ripple – An Analysis of Ripple Injection Techniques | 28 Apr 2014 | ||
| White paper | Wide VIN power management ICs simplify white paper (Rev. A) | 19 Sep 2013 | ||
| EVM User's guide | AN-1878 LM5085 Evaluation Board (Rev. B) | 30 Apr 2013 | ||
| Application note | Constant Current Constant Voltage Buck Converter w/LM25085 (Rev. A) | 23 Apr 2013 | ||
| Application note | Designing Non-Invert Buck-Boost (Zeta) Cnvrts w/a Buck P-FET Cntrl | 22 Apr 2011 |
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The LM5085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM5085 PFET switching controller which uses the constant on-time (COT) operating principle. The evaluation board provides a 5V output over an input range of 5.5V to 55V. The circuit (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HVSSOP (DGN) | 8 | Ultra Librarian |
| VSSOP (DGK) | 8 | Ultra Librarian |
| WSON (NGQ) | 8 | Ultra Librarian |
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